沒有可見@interface爲'UIView'聲明選擇器'addSubView：'

Question

我對iOS很新，我試圖在我的視圖控制器中添加UIActivityIndi​​cator，但它顯示錯誤「沒有可見的@interface for'UIView '聲明選擇器'addSubView：'「。我將自己的reference.can任何代碼提示我怎麼能糾正這個問題

-(void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; 
    spinner.center = CGPointMake([[UIScreen mainScreen]bounds].size.width/2, [[UIScreen mainScreen]bounds].size.height/2); 
    [_bcview addSubView:spinner];//bcview is the outlet connection for my viewcontroller 
} 

Answer 1

功能addSubview:拼寫與一個小寫v。所以你應該改變addSubView到addSubview

一般來說，你可以使用Xcode內建的建議功能，它會向你建議功能來解決這樣的問題。

Answer 2

此代碼的工作對我來說：

- (void)viewDidLoad{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 

    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; 

    CGSize size = [[UIScreen mainScreen] bounds].size; 
    [activityIndicator setCenter:CGPointMake(size.width/2, size.height/2)]; 

    [activityIndicator startAnimating]; 
    [_statusView addSubview:activityIndicator]; 
} 

與聲明中的.h

@property (weak, nonatomic) IBOutlet UIView *statusView;